Which of the Following Is True of Probability Sample Sizes

Which of the following is true of probability sample sizes?

A) The more precise the required sample results, the larger the sample size.
B) The smaller the desired error, the smaller the sample size.
C) The shorter the variability in the data being estimated, the larger the sample size needed.
D) The higher the level of confidence desired, the smaller the sample size needed.
E) The population standard deviation is a measure of the dispersion of the population, and its square root is referred to as the population variance.